Question

what is resistant (R) ....
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Answer 1

not harmed or affected by something

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Answer 2

ANSWER

Electrical Resistance

When an electric current flows through a bulb or any conductor, the conductor offers some obstruction to the current and this obstruction is known as electrical resistance and is denoted by R.

What is Electrical Resistance?

According to Ohm’s law, there is a relation between the current flowing through a conductor and the potential difference across it. It is given by,

V ∝ I V = IR

Where,

• V is the potential difference measured across the conductor (in volts)
• I is the current through the conductor (in amperes)
• R is the constant of proportionality called resistance (in ohms)

Electrical Resistance

The electrical resistance of a circuit is the ratio between the voltage applied to the current flowing through it.

Rearranging the above relation,

$\tt{R = \frac{V}{I} }$

The unit of electrical resistance is ohms.

$\tt{ohm = \frac{1 volt }{1ampere}}$

Electric charge flows easily through some materials than others. The electrical resistance measures how much the flow of this electric charge is restricted within the circuit.

Factors Affecting Electrical Resistance

The electrical resistance of a conductor is dependent on the following factors:

1. The cross-sectional area of the conductor
2. Length of the conductor
3. The material of the conductor
4. The temperature of the conducting material
5. Electrical resistance is directly proportional to length (L) of the conductor and inversely proportional to the cross-sectional area (A). It is given by the following relation.

$\tt{R = \frac{ρL}{A} }$

where ρ is the resistivity of the material (measured in Ωm, ohm meter)

More To Know

Materials with a low value of resistivity conduct electricity very well.

• Silver – 1.00×10−8
• Copper – 1.68×10−8
• Aluminium – 2.82×10−8
• Wood – 1.00×1014
• Air – 2.30×1016
• Teflon – 1.00×1023